WO2023077270A1 - Procédé d'égalisation de capacité de cellule de batterie, système de gestion de batterie et support de stockage - Google Patents

Procédé d'égalisation de capacité de cellule de batterie, système de gestion de batterie et support de stockage Download PDF

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WO2023077270A1
WO2023077270A1 PCT/CN2021/128199 CN2021128199W WO2023077270A1 WO 2023077270 A1 WO2023077270 A1 WO 2023077270A1 CN 2021128199 W CN2021128199 W CN 2021128199W WO 2023077270 A1 WO2023077270 A1 WO 2023077270A1
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battery
capacity
cell
voltage change
change rate
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PCT/CN2021/128199
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English (en)
Chinese (zh)
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彭雷
周美娟
徐广玉
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宁德时代新能源科技股份有限公司
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Priority to CN202180089430.3A priority Critical patent/CN116746021A/zh
Priority to PCT/CN2021/128199 priority patent/WO2023077270A1/fr
Publication of WO2023077270A1 publication Critical patent/WO2023077270A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

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  • the present application relates to the technical field of batteries, in particular to a battery cell capacity equalization method, a battery management system and a storage medium.
  • the batteries used in new energy vehicles are usually composed of multiple cells connected in series and parallel. With the continuous use of the battery, there will often be differences between the state of charge (State of Charge, SOC) of each cell in the battery at the same time, and each cell in the battery is usually in a charging state or a discharging state at the same time , which will cause the cells with higher SOC to be overcharged during charging when the cells with lower SOC are not fully charged, or, during discharge, the cells with higher SOC When the battery is not fully discharged, the battery with a lower SOC has been over-discharged, which will cause greater damage to the battery.
  • SOC state of Charge
  • the method to balance the SOC difference between the cells is: first calculate the minimum value of the output voltage of each cell as the minimum cell voltage, when the difference between the output voltage of a certain cell and the minimum cell voltage exceeds the preset value, it is considered that the difference between the SOC of the cell and the cell with the minimum cell voltage is too large.
  • the SOC of the cell will be used to subtract the preset capacity, for example, subtract 0.1% of the total capacity of the cell, as The updated SOC of the cell is to reduce the difference between the SOC of the cell and the cell with the minimum cell voltage output.
  • the embodiment of the present application provides a cell capacity equalization method, a battery management system, and a storage medium, which can quantitatively calculate the capacity difference between the cells, and directly perform one-time equalization on the cells based on the difference, reducing the amount of calculation and the time taken for the equalization process.
  • the embodiment of the present application provides a cell capacity equalization method, which is applied to a battery management system.
  • the battery management system is electrically connected to the battery, and the battery includes N cells, where N is an integer greater than 1; the method Including: when the battery is in the charging state, calculate the voltage change rate dV/dSOC of the battery; where the voltage change rate is the value obtained by differentiating the output voltage V of the battery from the current capacity SOC of the battery; record the value of the battery The moment when the voltage change rate meets the preset condition; according to the moment when the voltage change rate of the battery cell meets the preset condition and the function of the charging current for charging the battery cell with time, the corresponding balanced capacity of the battery cell is calculated, and according to the balanced capacity Cells are balanced.
  • the technical solution of the embodiment of the present application can only judge and equalize multiple batteries until the difference between the batteries is reduced to the allowable range, while the embodiment of the present application can directly Calculate the difference between the SOC of each battery cell, and use this as the balance capacity to perform a balance on each battery cell, which reduces the amount of calculation required for multiple judgments and speeds up the process of battery SOC balance.
  • the calculation of the corresponding balanced capacity of the battery cell includes: respectively obtaining the N battery cells The moment when the voltage change rate meets the preset conditions, and obtain the maximum value in the moment as the maximum moment value; calculate the definite integral of the time in the function of the charging current changing with time to charge the battery cell, and obtain the corresponding balanced capacity of the battery cell , where the lower limit of the definite integral is the moment when the voltage change rate of the cell meets the preset condition, and the upper limit of the definite integral is the maximum moment value.
  • the method before recording the moment when the voltage change rate of the battery cell satisfies the preset condition, the method further includes: acquiring the preset condition corresponding to the preset capacity range according to the preset capacity range in which the current capacity of the battery is located.
  • the corresponding preset condition is: the voltage change rate starts to be less than or equal to the first preset value.
  • the corresponding preset condition is: the voltage change rate is the maximum voltage change rate within a preset time period, Wherein, the preset time period includes the moment corresponding to the voltage change rate.
  • the corresponding preset condition is: the voltage change rate starts to be greater than or equal to the second preset value.
  • the embodiment of the present application provides a battery management system, the battery management system is electrically connected to the battery, and the battery includes N batteries, where N is an integer greater than 1; the system includes: a calculation module, a recording module and Balance module; the calculation module is used to calculate the voltage change rate dV/dSOC of the battery cell when the battery cell is in a charging state; where the voltage change rate is the value obtained by differentiating the output voltage V of the battery cell to the current capacity SOC of the battery cell.
  • the recording module is used to record the moment when the voltage change rate of the battery cell meets the preset condition; the equalization module is used to meet the time when the voltage change rate of the battery cell meets the preset condition and the function of the charging current for charging the battery cell over time, Calculate the balanced capacity corresponding to the battery cell, and balance the battery cell according to the balanced capacity.
  • the equalization module is specifically used to obtain the time when the voltage change rates of the N batteries meet the preset conditions, and obtain the maximum value at the time as the maximum time value, and then adjust the charging current for charging the battery Calculate the definite integral of the time in the time-varying function to obtain the corresponding equilibrium capacity of the battery, wherein the lower limit of the definite integral is the moment when the voltage change rate of the battery meets the preset condition, and the upper limit of the definite integral is the maximum moment value.
  • an embodiment of the present application provides a battery management system, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, The instructions are executed by at least one processor, so that the at least one processor can execute the above cell capacity balancing method.
  • the embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and implements the above cell capacity balancing method when the computer program is executed by a processor.
  • Fig. 1 is a schematic structural view of a vehicle disclosed in an embodiment of the present application
  • Fig. 2 is a schematic flow chart of a battery cell capacity equalization method disclosed in an embodiment of the present application
  • Fig. 3 is a schematic flow diagram II of a cell capacity equalization method disclosed in an embodiment of the present application.
  • Fig. 4 is a schematic flow diagram III of a cell capacity equalization method disclosed in an embodiment of the present application.
  • Fig. 5 is a partial change curve 1 of the voltage change rate of the battery cell with the SOC in a cell capacity equalization method disclosed in an embodiment of the present application;
  • Fig. 6 is a partial change curve 2 of the voltage change rate of the battery cell with the SOC in a cell capacity equalization method disclosed in an embodiment of the present application;
  • Fig. 7 is a partial change curve 3 of the voltage change rate of the battery cell with the SOC in a cell capacity equalization method disclosed in an embodiment of the present application;
  • Fig. 8 is a schematic flow diagram 4 of a cell capacity equalization method disclosed in an embodiment of the present application.
  • Fig. 9 is a schematic block diagram of a battery management system disclosed in an embodiment of the present application.
  • 501 calculation module
  • 502 recording module
  • 503 balance module
  • the batteries used in new energy vehicles are usually composed of multiple cells connected in series and parallel. With the continuous use of the battery, there will often be differences between the state of charge (State of Charge, SOC) of each cell in the battery at the same time, for example, at the same time, the SOC of one cell is 30%, and the other cell The SOC of the cell is 40%, which will cause the cell with the higher SOC to be overcharged when the cell with the lower SOC is not fully charged during the charging process.
  • SOC state of Charge
  • the method to balance the SOC difference between the cells is: first calculate the minimum value of the output voltage of each cell as the minimum cell voltage, when the difference between the output voltage of a certain cell and the minimum cell voltage exceeds the preset value, it is considered that the difference between the SOC of the cell and the cell with the minimum cell voltage is too large.
  • the SOC of the cell will be used to subtract the preset capacity, for example, subtract 0.1% of the total capacity of the cell, as The updated SOC of the cell is to reduce the difference between the SOC of the cell and the cell with the minimum cell voltage output.
  • the difference between the output voltage of the cell and the minimum cell voltage after the update still exceeds the preset If the value is set, it is considered that the difference between the SOC of the cell and the cell with the minimum cell voltage is still too large, and then the updated SOC of the cell is subtracted from the above preset capacity to further reduce the difference between the SOC. until the difference between the voltages of all cells and the minimum cell voltage is less than or equal to the preset value.
  • the above-mentioned method needs to judge and balance the SOC of the battery cells repeatedly, which requires a large amount of calculation, and the whole equalization process takes a long time.
  • the present application proposes the following technical idea: during the charging process of the battery cell with the platform area, calculate the voltage change rate dV/dSOC obtained by differentiating the output voltage V of the battery cell from the current capacity SOC of the battery cell, And according to the moment when the voltage change rate of the battery cell meets the preset condition and the charging current for charging the battery cell, calculate the corresponding equalization capacity of the battery cell, so as to directly balance the battery cell according to the calculated equalization capacity.
  • the embodiment of the present application provides a cell capacity equalization method, which is applied to a battery management system (Battery Management System, BMS).
  • BMS Battery Management System
  • the vehicle includes a battery management system 1 and a battery 2, and the battery The management system 1 is electrically connected to the battery 2, and the battery 2 includes N battery cells 21, where N is an integer greater than 1.
  • the battery cell 21 can be a battery cell with a plateau area on the open circuit voltage curve, such as a lithium iron phosphate (molecular formula LiFePO 4 , Lithium Iron Phosphate, LFP) battery cell, and the plateau area of the battery cell refers to the difference between the SOC and the battery cell.
  • LiFePO 4 Lithium Iron Phosphate
  • the SOC of the cell is estimated only based on the output voltage V of the cell and the corresponding relationship between the SOC of the cell and the output voltage V of the cell. If the output voltage V of the cell corresponds to In the platform area of the battery cell, there may be situations where multiple SOCs have a corresponding relationship with the output voltage V, and it is difficult to accurately estimate the SOC of the battery cell.
  • the battery management system 1 is electrically connected to the N cells 21 in the battery 2 (the connection structure is not shown in FIG. 1 ), so as to collect parameters such as temperature, voltage and current of each cell, and then observe The state of the battery cell, the battery management system 1 can also control each battery cell to be in a charging state or a discharging state.
  • the schematic flowchart of the cell capacity equalization method can refer to FIG. 2 , including:
  • Step 101 when the battery cell is in a charging state, calculate the voltage change rate dV/dSOC of the battery cell.
  • Step 102 recording the moment when the rate of change of the voltage of the cell satisfies a preset condition.
  • Step 103 according to the time when the rate of change of the voltage of the battery cell satisfies the preset condition and the function of the charging current for charging the battery cell over time, calculate the corresponding equilibrium capacity of the battery cell.
  • Step 104 balancing the cells according to the balancing capacity.
  • the voltage change rate dV/dSOC in step 101 is the value obtained by differentiating the output voltage V of the battery cell from the current capacity SOC of the battery cell.
  • the voltage change rate dV/dSOC can be approximately equal to ⁇ V / ⁇ SOC, where ⁇ SOC is the value obtained by integrating the current curve divided by the total capacity of the cell.
  • the time-varying function of the charging current for charging the battery can be any function that conforms to the current for charging the battery.
  • the magnitude of the charging current for charging the battery is constant, that is The function is a constant function, or a sinusoidal function that changes sinusoidally, which is not limited here.
  • the embodiments of the present application can directly calculate the SOC of each battery.
  • the amount of difference between them is used as the balance capacity to perform a balance on each battery cell, which reduces the amount of calculation required for multiple judgments and speeds up the process of battery SOC balance.
  • step 201 , step 202 and step 205 are substantially the same as step 101 , step 102 and step 104 , and will not be repeated here.
  • step 203 respectively obtain the time when the voltage change rates of the N cells meet the preset condition, and obtain the maximum value among the time as the maximum time value.
  • Step 204 calculate the definite integral for the time in the function of the charging current changing with time for charging the battery cell, and obtain the corresponding equilibrium capacity of the battery cell, wherein the lower limit of the definite integral is the moment when the voltage change rate of the battery cell satisfies the preset condition , the upper limit of the definite integral is the maximum moment value.
  • the BMS When the voltage change rate of a battery cell meets the preset condition, the BMS will record this moment as the moment when the voltage change rate of the battery cell meets the preset condition. After the moment when the voltage change rate meets the preset conditions, the maximum value of these moments will be obtained as the maximum moment value, and then the definite integral will be calculated for the time in the function of the charging current changing with time to charge the battery cell, and the corresponding value of the battery cell will be obtained.
  • the lower limit of the definite integral is the moment when the voltage change rate of the cell meets the preset condition
  • the upper limit of the definite integral is the maximum moment value, that is, the balance capacity corresponding to the cell is calculated using the ampere-hour integral method.
  • the BMS will use the cell with the lowest SOC as the benchmark to measure the difference between the SOC of the remaining cells and the cell with the lowest SOC. Specifically, the BMS will first subtract the moment when the voltage change rate of each battery cell meets the preset condition from the maximum time value, and obtain the difference corresponding to each battery cell as the equalization time, and then multiply the equalization time by the constant charging current , as the equilibrium capacity corresponding to each cell.
  • the battery includes 3 cells, and when the 3 cells are in the charging state, the BMS sequentially acquires time t 1 , t 2 and t 3 when the voltage change rates of the 3 cells meet the preset conditions.
  • t 3 is the maximum time value.
  • the equalization time is equal to t 3 -t 1
  • the equalization capacity is (t 3 -t 1 )*I, where I is the charging time for each cell Charging current, for the second cell, the equalization time is equal to t 2 -t 1 , the equalization capacity is (t 2 -t 1 )*I
  • the balance capacity is also 0.
  • each cell when the voltage change rate of some cells does not meet the preset condition, each cell will stop being charged. In this case, the BMS will not obtain the voltage change of all cells. The moment when the rate of change meets the preset condition, the BMS can record the moment when each cell stops being charged, as the moment corresponding to the cell whose voltage change rate does not meet the preset condition.
  • the battery includes 3 cells.
  • the BMS sequentially obtains the time t 1 and t 2 when the voltage change rate of the 2 cells meets the preset conditions, and the remaining When the voltage change rate of one battery cell does not meet the preset condition, each battery cell stops being charged.
  • the BMS will record the time t 0 when the battery cell stops being charged, as the voltage change rate that does not meet the preset condition.
  • the moment corresponding to one cell, obviously, t 0 is greater than t 1 and t 2 , so t 0 is taken as the maximum moment value.
  • the equalization time is equal to t 0 -t 1
  • the equalization capacity is (t 0 -t 1 )*I
  • the equalization time is equal to t 0 -t 1
  • the equalization capacity is (t 0 -t 1 )*I
  • step 301 , step 303 , step 304 and step 305 are substantially the same as step 101 , step 102 , step 103 and step 104 , and will not be repeated here.
  • Step 302 according to the preset capacity range where the current capacity of the battery is located, the preset condition corresponding to the preset capacity range is acquired.
  • the corresponding preset condition is: the voltage change rate starts to be less than or equal to the first preset value.
  • each cell is at the low end of the charge of the cell.
  • the current capacity of the battery is within 35% of the total capacity of the battery to 80% of the total capacity of the battery, it can be considered that each battery cell is in the charging platform area of the battery cell; when the current capacity of the battery is greater than 80% of the total capacity of the battery , it can be considered that each battery cell is at the charging end of the battery cell.
  • the charging rate of the battery cell corresponding to the different curves is different.
  • the curve corresponding to the charging rate of the battery cell it can be seen from the figure that when the battery cell is charged from the low charging end to the platform area, the voltage change rate of the battery cell will gradually approach 0, and it can be charged to this area by different batteries to identify the size of the SOC of different batteries.
  • the value of the ordinate corresponding to the differential point 1 is equal to the first preset value as an example, and the voltage change rate of each battery is recorded in turn to be less than or equal to the first preset value.
  • (t 1max -t 1n )*I is used as the equalization capacity corresponding to each battery cell for equalization.
  • the equalization capacity (t 1max -t 1n )*I can be divided by the equalization current for the battery cell to obtain the specific time for the battery cell to be balanced, and the battery cell is balanced according to the specific time, specifically
  • the timer can be used to balance the battery cells, and the balance will stop after the timer expires.
  • the setting of the first preset value is usually obtained by technicians through a large number of experimental tests before leaving the factory, specifically by testing the charging curves of different charging ratios, different charging temperatures and different aging degrees of the battery cells.
  • the SOC value corresponding to differential point 1 is obtained.
  • the corresponding preset condition is: the voltage change rate is the maximum voltage change rate within a preset time period, Wherein, the preset time period includes the moment corresponding to the voltage change rate.
  • the setting of the preset time period is usually obtained by technicians through a large number of experimental tests before leaving the factory.
  • (t 2max -t 2n )*I is used as the equalization capacity corresponding to each battery cell for equalization.
  • the equalization capacity (t 2max -t 2n )*I can be divided by the equalization current for the battery cell to obtain the specific time for the battery cell to be balanced, and the battery cell is balanced according to the specific time, specifically The timer can be used to balance the battery cells, and the balance will stop after the timer expires.
  • the corresponding preset condition is: the voltage change rate starts to be greater than or equal to the second preset value.
  • the equalization capacity (t 3max -t 3n )*I can be divided by the equalization current for the battery cell to obtain the specific time for the battery cell to be balanced, and the battery cell is balanced according to the specific time, specifically
  • the timer can be used to balance the battery cells, and the balance will stop after the timer expires.
  • the setting of the second preset value is usually obtained by technicians through a large number of experimental tests before leaving the factory, specifically by testing the charging curves of different charging ratios, different charging temperatures and different aging degrees of the battery cells.
  • the SOC value corresponding to the differential point 3 is obtained.
  • the embodiment of the present application does not limit the sequence of steps 301 and 302, that is, the preset conditions corresponding to the preset capacity range can be obtained first, and the voltage change rate dV/dSOC of the battery cell can also be obtained first.
  • the above only exemplifies three specific preset capacity ranges and their corresponding preset conditions, and does not limit the preset capacity range of the battery cell to the above three specific preset capacity ranges, nor does it limit the preset
  • the number of capacity ranges is not necessarily three, and there is no limit to the preset conditions corresponding to each preset capacity range is the above three preset conditions, as long as any technical solution that meets the charging characteristics of the battery in the platform area is in within the protection scope of this application.
  • step 401 it is determined whether the battery cell is in a charging state, if yes, enter step 402; if not, repeat step 401.
  • Step 402 when the current capacity of the battery is within the preset capacity range, read parameters such as the voltage and temperature of the battery cell.
  • Step 403 calculate the voltage change rate of the battery cell according to the parameters such as the voltage and temperature of the battery cell.
  • Step 404 judging whether the voltage change rate of the cell meets the preset condition, if yes, proceed to step 405 ; if not, return to step 403 .
  • Step 405 recording the moment when the rate of change of the voltage of the cell meets the preset condition.
  • Step 406 after recording the moment when the voltage change rates of all cells meet the preset condition, calculate the time required for each cell to be balanced: (t max -t n )*I/I bal .
  • t max is the maximum current value
  • t n is the moment when the voltage change rate of each cell meets the preset condition
  • I is the charging current for charging the cell
  • I bal is the balancing current required for balancing the cell.
  • Step 407 balancing the cells according to the balancing current I bal required for balancing and the balancing time of the cells until the balancing time of all cells is 0.
  • the corresponding preset conditions are: the voltage change rate starts to be less than or equal to the first preset value; 50% to 80% of the total capacity of the battery, the corresponding preset condition is: the voltage change rate is the maximum voltage change rate within a preset time period, wherein the preset time period includes the moment corresponding to the voltage change rate;
  • the preset capacity range is from 80% of the total capacity of the battery to the total capacity of the battery, the corresponding preset condition is: the voltage change rate starts to be greater than or equal to the second preset value.
  • the BMS first needs to obtain the current capacity of the battery. For example, if the current capacity of the battery is 30% of the total battery capacity, it can be judged that the current capacity of the battery is between 0 and 50% of the total capacity of the battery. It is set within the capacity range, so the preset condition at this time is: the voltage change rate starts to be less than or equal to the first preset value, that is, the BMS needs to obtain the moment when each battery cell is charged to the differential point 1 in Figure 5; for example, the battery If the current capacity of the battery is 65% of the total capacity of the battery, it can be judged that the current capacity of the battery is within the preset capacity range of 50% of the total capacity of the battery to 80% of the total capacity of the battery, so the preset conditions at this time are: The voltage change rate is the maximum voltage change rate within the preset time period, wherein the preset time period includes the moment corresponding to the voltage change rate, at this time, the BMS needs to obtain the moment when each cell is charged to the differential point 2 in Figure
  • An embodiment of the present application provides a battery management system, the battery management system is electrically connected to a battery, and the battery includes N cells, where N is an integer greater than 1.
  • the battery cell may be a battery cell with a plateau area in the open circuit voltage curve.
  • the battery management system includes: a calculation module 501 , a recording module 502 and an equalization module 503 , the calculation module 501 is connected to the recording module 502 , and the recording module 502 is connected to the equalization module 503 .
  • the calculation module 501 will calculate the voltage change rate dV/dSOC of the battery cell when the battery cell is in the charging state, wherein the voltage change rate is the value obtained by differentiating the output voltage V of the battery cell from the current capacity SOC of the battery cell, and then by
  • the recording module 502 records the moment when the voltage change rate of the battery cell meets the preset condition, and finally the balance module 503 calculates according to the time when the voltage change rate of the battery cell meets the preset condition and the function of the charging current for charging the battery cell over time. The corresponding balance capacity of the battery cell, and balance the battery cell according to the balance capacity.
  • this embodiment is a system embodiment corresponding to the embodiment corresponding to FIG. 2 , and this embodiment can be implemented in cooperation with the embodiment corresponding to FIG. 2 .
  • the relevant technical details mentioned in the embodiment corresponding to FIG. 2 are still valid in this embodiment, and are not repeated here to reduce repetition.
  • the relevant technical details mentioned in this embodiment may also be applied in the embodiment corresponding to FIG. 2 .
  • the equalization module 503 will respectively obtain the time when the voltage change rates of the N batteries meet the preset conditions, and obtain the maximum value in the time as the maximum time value, and then adjust the charging current for charging the battery cells with Calculate the definite integral of the time in the function of time change to obtain the corresponding equilibrium capacity of the battery, wherein the lower limit of the definite integral is the moment when the voltage change rate of the battery meets the preset condition, and the upper limit of the definite integral is the maximum moment value.
  • this embodiment is a system embodiment corresponding to the embodiment corresponding to FIG. 3 , and this embodiment can be implemented in cooperation with the embodiment corresponding to FIG. 3 .
  • the relevant technical details mentioned in the embodiment corresponding to Fig. 3 are still valid in this embodiment, and will not be repeated here in order to reduce repetition.
  • the relevant technical details mentioned in this embodiment may also be applied in the embodiment corresponding to FIG. 3 .
  • An embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and implements the above cell capacity balancing method when the computer program is executed by a processor.
  • a storage medium includes several instructions to make a device ( It may be a single-chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

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Abstract

L'invention concerne un procédé d'égalisation de capacité de cellule de batterie, un système de gestion de batterie et un support de stockage. Le procédé d'égalisation est appliqué au système de gestion de batterie (1), le système de gestion de batterie (1) est électriquement connecté à une batterie (2), et la batterie (2) comprend N cellules de batterie (21), N étant un nombre entier supérieur à 1. Le procédé comprend : lorsqu'un élément de batterie (21) est dans un état de charge, le calcul du taux de variation de tension dV/dSOC de la cellule de batterie (21), le taux de variation de tension étant une valeur obtenue par différenciation d'une tension de sortie V de la cellule de batterie (21) à partir d'une capacité de courant SOC de la cellule de batterie (21) ; l'enregistrement du moment où le taux de variation de tension de la cellule de batterie (21) remplit une condition prédéfinie ; et en fonction du moment où le taux de variation de tension de la cellule de batterie (21) remplit la condition prédéfinie et d'une fonction du courant de charge changeant avec le temps pour charger la cellule de batterie (21), le calcul d'une capacité d'égalisation correspondant à la cellule de batterie (21), et l'égalisation de la cellule de batterie (21) en fonction de la capacité d'égalisation. La différence de capacité entre les éléments de batterie (21) est calculée quantitativement, et les cellules de batterie (21) sont directement soumises à une égalisation en une seule fois en fonction de la différence, réduisant ainsi la quantité de calcul et le temps consommé pendant l'égalisation.
PCT/CN2021/128199 2021-11-02 2021-11-02 Procédé d'égalisation de capacité de cellule de batterie, système de gestion de batterie et support de stockage WO2023077270A1 (fr)

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CN202180089430.3A CN116746021A (zh) 2021-11-02 2021-11-02 电芯容量均衡方法、电池管理系统和存储介质
PCT/CN2021/128199 WO2023077270A1 (fr) 2021-11-02 2021-11-02 Procédé d'égalisation de capacité de cellule de batterie, système de gestion de batterie et support de stockage

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CN116404727A (zh) * 2023-06-02 2023-07-07 瑞浦兰钧能源股份有限公司 二次电池的管理方法和管理系统
CN116916374A (zh) * 2023-09-13 2023-10-20 羿动新能源科技有限公司 动力电池无线bms信道质量评价方法和评价系统
CN117559614A (zh) * 2024-01-11 2024-02-13 西安奇点能源股份有限公司 一种串联电池pack充放电均衡控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102027655A (zh) * 2008-03-31 2011-04-20 A123系统公司 用于检测电池或电容串联组中的电池单元充电状态和放电状态的散度的方法
JP2016014588A (ja) * 2014-07-02 2016-01-28 日産自動車株式会社 バッテリ管理装置
CN106385062A (zh) * 2015-07-31 2017-02-08 比亚迪股份有限公司 电池组均衡方法及装置
CN110323793A (zh) * 2018-03-30 2019-10-11 比亚迪股份有限公司 汽车、动力电池组的均衡方法和装置
CN110729797A (zh) * 2019-11-13 2020-01-24 昆山宝创新能源科技有限公司 车辆及其电池组均衡的控制方法、装置和系统

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102027655A (zh) * 2008-03-31 2011-04-20 A123系统公司 用于检测电池或电容串联组中的电池单元充电状态和放电状态的散度的方法
JP2016014588A (ja) * 2014-07-02 2016-01-28 日産自動車株式会社 バッテリ管理装置
CN106385062A (zh) * 2015-07-31 2017-02-08 比亚迪股份有限公司 电池组均衡方法及装置
CN110323793A (zh) * 2018-03-30 2019-10-11 比亚迪股份有限公司 汽车、动力电池组的均衡方法和装置
CN110729797A (zh) * 2019-11-13 2020-01-24 昆山宝创新能源科技有限公司 车辆及其电池组均衡的控制方法、装置和系统

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116404727A (zh) * 2023-06-02 2023-07-07 瑞浦兰钧能源股份有限公司 二次电池的管理方法和管理系统
CN116404727B (zh) * 2023-06-02 2023-09-19 瑞浦兰钧能源股份有限公司 二次电池的管理方法和管理系统
CN116916374A (zh) * 2023-09-13 2023-10-20 羿动新能源科技有限公司 动力电池无线bms信道质量评价方法和评价系统
CN116916374B (zh) * 2023-09-13 2024-01-26 羿动新能源科技有限公司 动力电池无线bms信道质量评价方法和评价系统
CN117559614A (zh) * 2024-01-11 2024-02-13 西安奇点能源股份有限公司 一种串联电池pack充放电均衡控制方法
CN117559614B (zh) * 2024-01-11 2024-04-02 西安奇点能源股份有限公司 一种串联电池pack充放电均衡控制方法

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